Abstract
Based on the monthly average SST and 850 hPa monthly average wind data, the seasonal, interannual and long-term variations in the eastern Indian Ocean warm pool (EIWP) and its relationship to the Indian Ocean Dipole (IOD), and its response to the wind over the Indian Ocean are analyzed in this study. The results show that the distribution range, boundary and area of the EIWP exhibited obviously seasonal and interannual variations associated with the ENSO cycles. Further analysis suggests that the EIWP had obvious long-term trend in its bound edge and area, which indicated the EIWP migrated westwards by about 14 longitudes for its west edge, southwards by about 5 latitudes for its south edge and increased by 3.52×106 km2 for its area, respectively, from 1950 to 2002. The correlation and composite analyses show that the anomalous westward and northward displacements of the EIWP caused by the easterly wind anomaly and the southerly wind anomaly over the eastern equatorial Indian Ocean played an important and direct role in the formation of the IOD.
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References
Delcroix T, Dewitte B, duPenhoat Y et al. 2000. Equatorial waves and warm pool displacements during the 1992–1998 El Niño-Southern Oscillation events: Observation and modeling. J. Geophys. Res., 105: 26 045–26 062.
Ding Y G, Jiang Z H. 1998. Processing for the signal of meteorological data time series. Meteorology Press, Beijing, China. pp, 18–50. (in Chinese)
Gopinathan C K, Sastry J S. 1990. Relationship between Indian summer monsoon rainfall and position of Pacific Ocean warm pool. Indian J. Marine Sciences, 19: 246–250.
Huang R H, Sun F Y. 1994. Impacts of the thermal state and the convective activities in the tropical western Pacific warm pool on the summer climate anomalies in the East Asia. Scientia Atmospherica Sinica, 18(2): 141–151. (in Chinese with English abstract)
Li C Y, Mu M Q. 2001. The dipole in the equatorial Indian Ocean and its impacts on climate. Chinese Journal of Atmospheric Sciences, 25(4): 433–442. (in Chinese with English abstract)
Liu N, Yu W D, Chen H X et al. 2005. Interannual variation of the Indo-Pacific warm pool and the atmospheric response to the variations. Advances in Marine Science, 23(3): 249–255. (in Chinese with English abstract)
Liu N, Jia Z, Chen H X et al. 2006. Southern high latitude climate anomalies associated with the Indian Ocean dipole mode. Chinese Journal of Oceanology and Limnology, 24(2): 125–128.
Long B S, Li B C, Zou E M. 1990. Anomalous eastward displacement of the western tropical Pacific warm pool and warming of the eastern tropical Pacific. Acta Oceanologica Sinica, 20(2): 35–42. (in Chinese with English abstract)
Matsuura T, Iizuka S. 2000. Zonal migration of the Pacific warm-pool tongue during El Niño events. J. Phys. Oceanogr., 30: 1 582–1 600.
McPhaden M J, Picaut J. 1990. El Niño-oscillation, displacement of the western equatorial Pacific warm pool. Science, 250: 1 385–1 388.
Meng X F, Wu D X. 2002. Contrast between the climatic states of the warm pool in the Indian Ocean and in the Pacific Ocean. Journal of Ocean University of Qingdao, 1(2): 119–124.
Picaut J, Ioualalen M, Delcroix T et al. 2001. The oceanic zone of convergence on the eastern edge of the Pacific warm pool: A synthesis of results and implication for El Niño-Southern Oscillation and biogeochemical phenomena. J. Geophys. Res., 106(c2): 2 363–2 386.
Qi Q H, Zhang Q L, Hou Y J. 2008. Zonal displacement of the western Pacific Warm Pool and its effects on ENSO. Oceanologia et Limnologia Sinica, 39(1): 66–73. (in Chinese with English abstract)
Saji N H, Goswami B N, Viayachandrom P N et al. 1999. A dipole mode in the tropical Indian Ocean. Nature, 401: 360–363.
Webster P T, Moore A M, Loschning J P et al. 1999. Couple ocean-atmosphere dynamics in the Indian Ocean during 1997–1998. Nature, 401: 356–360.
Weng X C, Zhang Q L, Yan T Z. 1998. The tropical western Pacific warm pool and its relations to the Southern Oscillation and subtropical high over the west Pacific. Studia Marina Sinica, 40: 35–41. (in Chinese with English abstract)
Wyrtki K. 1989. Some thoughts about the west Pacific Warm Pool. Proceedings of the Western Pacific International Meeting and Workshop on TOGA-COARE. France institute of the scientific research for the development on the cooperation, New Caledonia. pp. 99–109.
Yan X H, Chung R H, Zheng Q A et al. 1992. Temperature and size variabilities of the Western Pacific Warm Pool. Science, 258: 1 643–1 645.
Zhang Q L, Weng X C. 1997. Some oceanographic characteristics of the tropical western Pacific warm pool. Studia Marina Sinica, 38: 31–38. (in Chinese with English abstract)
Zhang Q L, Weng X C. 1999. Analysis of heat content of the tropical western Pacific warm pool. Plateau Meteorology, 18(4): 584–589. (in Chinese with English abstract)
Zhang Q L, Weng X C. 2003. Variations of heat content field in the western Pacific warm pool area and their impact. Oceanologia et Limnologia Sinica, 34(4): 389–396. (in Chinese with English abstract)
Zhang Q L, Weng X C, Hou Y J et al. 2004. Zonal movement of surface warm water in the western Pacific warm pool. Acta Oceanologica Sinica, 26(1): 33–396. (in Chinese with English abstract)
Zhao Y P, Wu A M, Chen Y L et al. 2002. The climatic jump of the western Pacific warm pool and its climatic effects. Journal of Tropical Meteorology, 18(4): 317–326.
Zhou C P. 2001. The variations in the Oceanic Warm Pool and its impact. Meteorological Press, Beijing, China. pp. 22–133. (in Chinese)
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Supported by the National Key Basic Research Development Program of China (973 Program)(No. 2006CB403606), the Knowledge Innovation Program of Chinese Academy of Sciences (KZCX1-YW-12) and the National Natural Science Foundation of China (No. 40306006)
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Zhang, Q., Hou, Y., Qi, Q. et al. Variations in the eastern Indian Ocean warm pool and its relation to the dipole in the tropical Indian Ocean. Chin. J. Ocean. Limnol. 27, 640–649 (2009). https://doi.org/10.1007/s00343-009-9148-5
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DOI: https://doi.org/10.1007/s00343-009-9148-5